Bulgarian law enforcement jointly worked with the Southeast European Law Enforcement Center (SELC), a regional organization comprised of 12 member states, to bust a sophisticated organized-crime network, arresting twenty-three Bulgarian nationals and seizing a total of 213,519 bitcoins.
SELC described the organized-crime scheme as the hacking of Bulgarian Custom's computers and allowing those associated with the group to skip fees for importing goods into the country. To make it work, the group recruited corrupt Customs officers to upload a virus into government machines, so that hackers could establish remote access.
The organized criminal group consisted in Bulgarian nationals having connections in The former Yugoslav Republic of Macedonia, Hellenic Republic, Romania and Republic of Serbia. The modus operandi used was recruiting corrupted Customs officers in all involved countries with the purpose to infiltrate a virus in the Customs' computerized systems. Once the virus installed, from distance, the offenders were able to finalize various transports, as in the Customs' system appeared that the cargo was already checked and passed.